/**
 * Copyright (c) 2009-2011, chunquedong(YangJiandong)
 * 
 * This file is part of ChunMap project
 * Licensed under the GNU LESSER GENERAL PUBLIC LICENSE(Version >=3)
 * 
 * History:
 *     2010-05-05  Jed Young  Creation
 */
package chunmap.view.render;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Paint;
import java.awt.font.TextAttribute;
import java.text.AttributedString;

import chunmap.data.feature.Feature;
import chunmap.data.feature.Shape;
import chunmap.model.coord.Position;
import chunmap.model.elem.Envelope;
import chunmap.model.geom.Geometry;
import chunmap.view.View;

public class LabelSymbol extends Symbol{

	public Paint stringColor = Color.black;
	public int labelHide = 100;
	
	@Override
	public void draw(Graphics g, Feature f, View view) {
		if(f instanceof Shape){
			Shape shp=(Shape)f;
			drawLabel(g,shp.getGeometry(),shp.getLabel(),view);
		}
	}
	
	private void drawLabel(Graphics g, Geometry geo, String text, View view) {
		if (text == null || text == "") return;
		
		Envelope env=geo.getEnvelop().transform(view.world2Screen());
		if(env.getWidth()+env.getHeight()<labelHide)return;
		
		AttributedString astring = new AttributedString(text);
		astring.addAttribute(TextAttribute.FOREGROUND, stringColor);
		Position p = env.getCenter();
		g.drawString(astring.getIterator(), (int) p.getX(), (int) p.getY());
	}
}